tests/module: nix-ify

Use "#!/usr/bin/env bash" instead of "#!/bin/bash". This is necessary
for nix environments as they only provide /usr/bin/env at the standard
location.

Signed-off-by: Joel Granados <[e-mail]>
Acked-by: Luis Chamberlain <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Petr Pavlu <[e-mail]>

lib/tests/module/gen_test_kallsyms.sh

···
-#!/bin/bash
+#!/usr/bin/env bash
 
 TARGET=$(basename $1)
 DIR=lib/tests/module